The onion-tomato masala base is specifically a Northern and Central Indian technique — absent from South Indian cooking (which uses the dry tarka method) and distinct from the Mughal court tradition (which used yogurt as the liquid base rather than tomato, a New World ingredient). The tomato's arrival in India in the 16th century via the Portuguese was resisted for centuries; its integration into North Indian curry bases occurred gradually through the 18th and 19th centuries.
The wet masala — a slow-cooked base of onion, ginger, garlic, tomato, and ground spices — is the flavour foundation of most North Indian curries. It is not a sauce. It is a concentrated flavour paste produced by cooking aromatics until every drop of moisture has evaporated and the residual oil, now carrying every aromatic compound extracted from the vegetables and spices, is visible at the edges of the mass. The wet masala done correctly produces a foundation of extraordinary depth in 30 minutes. Done incorrectly — rushed, underdone — it produces a curry that tastes raw and flat regardless of how good the protein is.
The wet masala is CRM Family 05 — Fat-Soluble Aromatic Transfer — extended through multiple phases. Each stage extracts fat-soluble compounds from the aromatics into the oil: onion's sulphur compounds, ginger's gingerol, garlic's allicin breakdown products, the spices' terpenes. By the time the oil re-emerges, it is not the neutral oil that went in — it is a fully flavoured fat carrying every aromatic compound from every ingredient that cooked in it.
**The sequence:** 1. Oil (neutral or ghee) at medium-high heat 2. Whole spices if used (bay, cardamom, cloves) — bloom 30–45 seconds 3. Onion: sliced thin or finely chopped — this stage takes the longest (15–20 minutes). The target colour varies by dish: pale gold for kormas and white gravies; deep amber for rogan josh and robust meat curries; very dark brown for certain regional specialties. [VERIFY] Bharadwaj's specific colour targets by dish. 4. Ginger-garlic paste: added when onion reaches target colour — the raw smell must cook out completely (3–4 minutes) before proceeding 5. Ground spices (turmeric, cumin, coriander, chilli): added with a splash of water to prevent burning. The water evaporates; the spices fry in the residual oil 6. Tomato: added and cooked until the oil separates from the masala mass — the visual signal (mirroring Burmese si byan) that the masala is ready **The oil separation:** This is the non-negotiable endpoint. The oil that was used to fry the onions, having been absorbed into the masala throughout the cooking, re-emerges as clear pools at the edges when the masala is fully cooked. Every molecule of water from the onion, tomato, and fresh aromatics has evaporated. The masala is now a dry, concentrated paste ready to receive the protein. **Ginger-garlic paste:** In Indian professional kitchens, ginger and garlic are ground together with a small amount of water into a smooth paste and kept refrigerated. This is prepared in advance (1 part ginger to 1 part garlic by weight, blended with a small amount of water). [VERIFY] Bharadwaj's ginger-garlic ratio. Decisive moment: The oil separation after tomato addition. This takes 8–12 minutes after the tomato is added. During this time the masala will bubble actively, then the bubbling will slow and the colour will deepen. When clear oil pools appear at the edges and the masala smells deeply cooked rather than of raw tomato, it is ready. Do not add protein before this point. Sensory tests: **Sight — oil separation:** Clear oil visible at the perimeter of the masala in the pan. The masala mass itself should look slightly glossy, concentrated, and reduced from its earlier volume. **Smell — raw to cooked transition:** The smell of raw garlic and raw tomato gives way to a rounded, deeply savoury smell as the masala completes. Any residual raw note means more cooking is needed. **Sight — onion colour:** For medium-depth curries: the onion should be deep golden — the colour of a well-tanned complexion. Any pale or translucent onion indicates under-cooking that will produce a sweet, flat curry.
— **Spices burn before tomato is added:** The pan was too dry when ground spices were added. Always add a splash of water with ground spices. They fry in the oil but the water prevents direct charring. — **Raw garlic taste in finished curry:** The ginger-garlic paste did not cook long enough — the volatile sulphur compounds from raw garlic persist. Cook until the raw smell is completely gone before proceeding. — **Watery curry that doesn't thicken:** Tomato added before the oil re-emerged from the onion cooking. The sequence was rushed. The masala cannot finish cooking properly once the protein is added.
Indian Cookery Course